\documentclass{article}
\usepackage{amssymb,amsmath,amscd,concmath}
\pagestyle{empty}
\begin{document}
\begin{equation*} \mathbf p = \frac{m \mathbf v}{\sqrt{1 - \frac{v^2}{c^2}}} \,\!\end{equation*}
\end{document}
